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Thats weird then.
It was at 0 microns not hooked up to anything for about 10 mins- then hooked it to a vacuum pump and got stuck working on something else cut it back on it and was reading properly.

I have used it alot today because i was playing with our vacuum pump graveyard and vacuuming out recovery tanks(9). 3 out of 4 pumps that were "bad" (sad to say before we used micron gauges) are good now. changed the oil and tightened a couple of fittings and one capacitor later. They all pull down between 20-60 microns in under a minute. We got one frankesteen pump up and running with parts off of the one that i couldn't get working. It has a bad seal too bad its not just the oil resovior seal its coming from underneath.
They are all robinair pumps i know one is a 6 cfm pump the other ones the labels are wore off. For doing that i got an okay to order some new micron gauges for our techs looks like they will get some yellow uei / (bluvacs) from jmart and can get rid of some of the old ones that are not very accurate at all.